Reinsurance (Details Textual) (USD $) In Millions, unless otherwise specified		1 Months Ended
	Mar. 31, 2013	Jun. 01, 2012 E&S Commercial [Member]	Mar. 31, 2013 Excess and Umbrella Business Unit [Member]	Mar. 31, 2013 Standard Commercial Segment [Member]	Jun. 01, 2012 Professional Liability [Member]	Jun. 01, 2012 Professional Liability [Member] Prior to June 1, 2012 [Member]	Mar. 31, 2013 Hallmark County Mutual [Member]	Mar. 31, 2013 Catastrophe [Member]	Mar. 31, 2013 Commercial Property [Member]	Mar. 31, 2013 Commercial Liability Risk [Member]	Mar. 31, 2013 Workers Compensation Risks [Member]	Mar. 31, 2013 Aircraft Hull [Member]	Mar. 31, 2013 Liability Loss [Member]	Mar. 31, 2013 Airport Liability Loss [Member]	Feb. 01, 2013 Personal Lines business unit [Member]
Retention for Reinsurance Losses								$ 6.0	$ 1.0	$ 1.0	$ 1.0	$ 1.0	$ 1.0	$ 1.0
Commercial Property Risk Value								15.0	6.0
Reinsurers Reimbursement, Percentage	87.50%							100.00%			100.00%
Reinsurers Reimbursement Retention for Any One Disaster Occurrence									10.0
Reinsurers Reimbursement Retention for Each Disaster Occurrence								9.0	5.0	5.0	14.0	5.5	5.5	4.0
Reinsurers Reimbursement Retention, Maximum Limit								25.0			10.0
Reinsurers Reimbursement Retention, Aggregate Limit								50.0	30.0		28.0
Proportional Reinsurance Cede Risk, Percentage				100.00%											60.00%
Proportional Reinsurance Retention, Percentage		10.00%	20.00%		50.00%	40.00%	100.00%
Concentration of Ceded Credit Risk, Percentage		100.00%	80.00%		50.00%	60.00%
Concentration of Ceded Credit Risk Remaining, Percentage		90.00%
Reinsurance Effect on Claims and Benefits Incurred, Amount Ceded		$ 1.0